fix bounds check for ctables (thanks Hal)

src/core/SkColorTable.cpp

Index: src/core/SkColorTable.cpp
diff --git a/src/core/SkColorTable.cpp b/src/core/SkColorTable.cpp
index e461a095f0d096416846c01247c0bdd99fdab135..ca9a8657c4132cc565e998522978128d89ce6f7c 100644
--- a/src/core/SkColorTable.cpp
+++ b/src/core/SkColorTable.cpp
@@ -36,7 +36,7 @@ SkColorTable::SkColorTable(SkPMColor* colors, int count, AllocatedWithMalloc)
     : fColors(colors)
     , fCount(count)
 {
-    SkASSERT(count > 0 && count <= 255);
+    SkASSERT(count > 0 && count <= 256);
     SkASSERT(colors);
 }
 
@@ -108,7 +108,7 @@ SkColorTable* SkColorTable::Create(SkReadBuffer& buffer) {
         return new SkColorTable(nullptr, 0);
     }
 
-    if (count < 0 || count > 255) {
+    if (count < 0 || count > 256) {
         buffer.validate(false);
         return nullptr;
     }